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173 Ino

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173 Ino

173 Ino is a large asteroid and the parent body of the Ino family, located in the central regions of the asteroid belt, approximately 150 kilometers (93 miles) in diameter. It was discovered on 1 August 1877, by French astronomer Alphonse Borrelly at Marseille Observatory in southern France, and named after the queen Ino from Greek mythology.[1][3] The dark Xk-type asteroid has a rotation period of 6.15 hours.[21]

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173 Ino
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Discovery[1]
Discovered byA. Borrelly
Discovery siteMarseille
Discovery date1 August 1877
Designations
(173) Ino
Pronunciation/ˈaɪnoʊ/ EYE-noh[2]
Named after
Ἰνώ Īnṓ[3] (Greek mythology)
A877 PA; 1922 SB
main-belt[1][4] · (middle)
Ino[5]
AdjectivesInoan (/aɪˈnoʊən/ eye-NOH-ən)[6]
Orbital characteristics[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc138.75 yr (50,678 d)
Aphelion3.3142 AU
Perihelion2.1708 AU
2.7425 AU
Eccentricity0.2085
4.54 yr (1,659 d)
307.27°
0° 13m 1.2s / day
Inclination14.197°
148.18°
228.89°
Physical characteristics
145±3 km[7]
119±27 km[8]
125.8±1.5 km[9]
148±42 km[10]
154.1±3.5 km[11]
160.6 km[12]
Flattening0.24[a]
Mass(2.2±1.3)×1018 kg[7]
(4.79±3.11)×1018 kg[13]
Mean density
1.4±0.8 g/cm3[7]
2.23±1.47 g/cm3[13]
5.93 h[14]
6.1±0.2 h[15]
6.106±0.001 h[15]
6.1088±0.0007 h[15]
6.11 h[16]
6.113±0.002 h[17]
6.11651 h[18]
6.15 h[19][4]
6.163 h[20]
0.061 (calculated)[7]
0.059[12]
0.06±0.02[10]
0.0642±0.003[11]
0.07±0.05[8]
0.096±0.018[9][4]
Tholen = C[4]
SMASS = Xk[4]
B–V = 0.705[4]
U–B = 0.305[4]
7.66[9][10][11][12][21]
7.99[4]
7.80±0.05[22]
7.90[8][23]
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    Orbit and classification

    Ino is the parent body and namesake of the Ino family (522),[5] an asteroid family in the intermediate main belt with nearly 500 known members.[24]: 23  The adjectival form of the asteroid name is "Inoan".

    It orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,659 days; semi-major axis of 2.74 AU). Its orbit has an eccentricity of 0.21 and an inclination of 14° with respect to the ecliptic.[4] The body's observation arc begins at Düsseldorf-Bilk Observatory in January 1879, five months after its official discovery observation at Marseilles.[1]

    Physical characteristics

    In the Tholen classification, Ino is a common carbonaceous C-type, while in the SMASS classification it is a Xk-subtype that transitions between the X-type and uncommon K-type asteroids.[4]

    Multiple photometric studies of this asteroid were performed between 1978 and 2002. The combined data gave an irregular, asymmetrical light curve with a period of 6.163 ± 0.005 hours and a brightness variation of 0.10–0.15 in magnitude. The asteroid is rotating in a retrograde direction.[18]

    Notes

    1. Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = 0.76±0.06.[7]

    References

    External links

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